ham·mer·head

[ham-er-hed]
noun
1.
the part of a hammer designed for striking.
2.
a shark of the genus Sphyrna, especially S. zygaena, having the head expanded laterally so as to resemble a double-headed hammer, sometimes dangerous to swimmers.
3.
Also called ham·mer·kop [ham-er-kop] . a brown heronlike African bird, Scopus umbretta, having the head so crested as to resemble a claw hammer.
5.
Slang. blockhead; dunce; lout.

Origin:
1525–35; hammer + head

ham·mer·head·ed, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Hammerhead is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a chattering or flighty, light-headed person.
Collins
World English Dictionary
hammerhead (ˈhæməˌhɛd) [Click for IPA pronunciation guide]
 
n
1.  any shark of the genus Sphyrna and family Sphyrnidae, having a flattened hammer-shaped head
2.  a heavily built tropical African wading bird, Scopus umbretta, related to the herons, having a dark plumage and a long backward-pointing crest: family Scopidae, order Ciconiiformes
3.  a large African fruit bat, Hypsignathus monstrosus, with a large square head and hammer-shaped muzzle
 
'hammerheaded
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Slang Dictionary

hammerhead definition


  1. n.
    a stupid person; a person whose head seems to be as solid as a hammer. : You can be such a hammerhead!
  2. n.
    a drunkard or a drug user. : These hammerheads can't even hold a simple job for the most part.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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Encyclopedia Britannica
Encyclopedia

hammerhead

(Scopus umbretta), African wading bird, the sole species of the family Scopidae, within the order Ciconiiformes, which also includes herons, flamingos, and storks. The hammerhead ranges over Africa south of the Sahara and occurs on Madagascar and in southwestern Arabia. It is about 60 cm (2 feet) long, nearly uniform umber or earthy brown in colour, and bears a conspicuous horizontal crest on the back of its large head. The heavy, compressed, hook-tipped bill and short legs are black. Active especially at twilight, the bird sits beside a stream with its head down or wades slowly, stirring the mud with one foot and then the other, feeding on mollusks, frogs, small fishes, and aquatic insects. It builds an enormous nest of sticks, sometimes 1.8 m (6 feet) across and 1.2 m (4 feet) high, on a rocky ledge or in a tree. The nest is dome shaped with an entrance on the side and a narrow tunnel leading to a central chamber lined with mud. The bird lays three to six chalky-white eggs

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The hammerhead shark uses its head to pin down prey, or food, while eating.
With lethargic grace, the hammerhead shark slices through the blue gloom.
Scalloped hammerhead sharks, also on the globally endangered species list, also
  live in the waters.
If the idea proves to be valid, it could provide a big piece of the puzzle in
  the mystery of hammerhead shark migration.
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